Centralized Pressure Compensation for Vehicle Drive Housings
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Solution Overview
Problem
Existing drive mechanisms for vehicles face challenges in pressure compensation, requiring multiple individual pressure compensating members for each drive component, which increases complexity and costs, and does not effectively prevent water ingress during water submersion.
Innovation Solution
A centralized pressure compensating assembly connects the air spaces of all drive components in an air-permeable manner, with a common pressure compensating member disposed above the wading line, eliminating the need for multiple individual members and reducing complexity and costs by centralizing pressure compensation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple individual pressure compensating members are used for each drive component, then pressure compensation is achieved, but device complexity and costs increase
Solution Approach 1:
The patent combines multiple individual pressure compensating members into a single centralized pressure compensating assembly that serves all drive components (electrical machine, power electronics unit, transmission). This assembly includes a common housing with air-permeable connections to multiple air spaces, eliminating the need for separate compensating members for each component while maintaining effective pressure compensation across all enclosed air spaces.
2Reliability
If pressure compensating members are positioned below the wading line, then pressure compensation is effective, but water ingress occurs during water submersion
Solution Approach 1:
The patent positions the centralized pressure compensating assembly in a vertical dimension above the wading line, rather than at component level. The assembly includes a vent line with a snorkel that extends upward to an opening positioned above the maximum wading depth, allowing air exchange for pressure compensation while preventing water ingress during vehicle submersion.
3Device complexity
If a centralized pressure compensating assembly is used, then device complexity is reduced, but connection length and routing complexity increase
Solution Approach 1:
The patent introduces a centralized pressure compensating assembly as an intermediary component that consolidates multiple pressure compensation functions. The assembly includes a common housing with multiple air-permeable connections to different drive components, serving as a central hub that simplifies the overall system architecture despite requiring vent lines to connect to various components.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution significantly reduces the effort and costs associated with pressure compensation, prevents water ingress, and simplifies the design by using a single central pressure compensating member for all drive components, eliminating the need for additional vent hoses or snorkels.
Implementation Method 1
the at least one pressure compensating member connects the air spaces enclosed by the housings of any and all drive components of the drive mechanism in an air-permeable manner to surroundings or to an environment
Implementation Method 2
Since the at least one pressure compensating member is disposed above the wading line and thus above the wading depth, ingress of water from the body of water into the pressure compensating member and thus into the drive mechanism is prevented
Data Source
AI summary
A pressure compensating assembly for a drive mechanism of a vehicle, wherein the drive mechanism includes as drive components an electrical machine a power electronics unit, and a transmission, wherein each drive component is disposed in a respective housing which encloses an air space, wherein at least two air spaces of adjacent housings are interconnected in an air-permeable manner, wherein the pressure compensating assembly includes a pressure compensating member common to all drive components, which member connects the air spaces of all drive components of the drive mechanism to an environment and is disposed above a wading line of the vehicle when the pressure compensating assembly is installed in the vehicle.